3. Julia Kochis a businesswoman with an estimated net worth of $52.1 billion. She made her fortune in the oil and gas industry, founding her own company in 1980.
4. Jacqueline MarsJacqueline Mars is the heiress to the Mars candy fortune. She and her brothers, Forrest Jr., and John, inherited the company from their father in 1999.
5. Gina RinehartAn Australian businesswoman who inherited her families’ mining company and has since expanded it into a major player in the industry. Her net worth is estimated at $31 billion.